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Inductors

Inductors
An inductance of 0.08 μH is larger than

0.0000008 H
0.00008 mH
0.000000008 H
0.000008 H

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Inductors
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

VL > VR
VL = VR
VL < VR
VR ≥ VL

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Inductors
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is

5.5 mH
less than 5.5 mH
55 mH
less than 0.2 mH

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Inductors
The winding resistance of a coil can be increased by

changing the core material
increasing the number of turns
increasing the number of turns or using thinner wire
using a thinner wire

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Inductors
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

400 mA
57 mA
91 mA
78 mA

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Inductors
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

219 kΩ
660 kΩ
66 kΩ
1.3 MΩ

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